Mateusz Mędrek
Senior React Native Developer
Olsztyn, Warmian-Masurian Voivodeship, Poland
Summary
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RockstarMateusz Mędrek is a Senior React Native Developer with nine years of mobile-first experience, currently building cross-platform apps at Callstack after senior roles at Netguru. He specializes in robust Android and iOS UI components, contributing notable improvements to popular open-source libraries like react-native-picker and react-native-menu—adding RTL support, focus events, sub-menus and advanced styling options. Comfortable across native and JS layers, he has a track record of fixing build/tooling issues, upgrading SDKs, and improving example apps to help adopters ship faster. Based in Olsztyn, Poland, he brings a pragmatic engineering approach that blends deep platform knowledge with attention to developer experience and accessibility edge cases.
9 years of coding experience
4 years of employment as a software developer
Github Skills (29)
javascript10
react-native10
expo10
java10
javas10
android10
android-ui10
react10
number-picker9
headers9
image-picker9
color-picker9
kotlin9
people-picker9
photopicker9
Programming languages (8)
Github contributions (5)
netguru/sticky-parallax-header
Mar 2022 - Jan 2023
A simple React Native library, enabling the creation of fully customized header for your iOS and Android apps.
Role in this project:
Mobile Developer (iOS/Android)
Mobile Developer (iOS/Android)Contributions:2 releases, 22 reviews, 103 commits in 9 months
Contributions summary:Mateusz primarily focused on improving the example application within the React Native library. Their contributions included fixing webpack and metro configuration issues, resolving conflicting file names, and upgrading the Expo SDK. They also addressed bugs, such as removing a debugger statement, and implemented new features with primitive components, including creating custom HOC, and wrapping ScrollView, FlatList and SectionList. Moreover, the user worked on various aspects of the UI, adding and refining the components used for the header.
parallaxreactandroid-appsheaderreact-native-library
react-native-menu/menu
Mar 2021 - Jul 2021
UIMenu Component for React Native
Role in this project:Mobile Developer (Android)
Mobile Developer (Android)Contributions:1 review, 6 commits, 6 PRs in 3 months
Contributions summary:Mateusz primarily contributed to the Android implementation of the React Native menu component. Their work includes adding features like action attributes (destructive, hidden, disabled), title color, image support with color customization, and anchoring the popup menu to the right. Furthermore, the user implemented sub-menu functionality, and long press support for menu activation and addressed Android type mismatches within the project.
reactreact-nativeiosuiactionuimenu
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